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uSimpleBrowser.pas
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uSimpleBrowser.pas
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// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF3 to embed a chromium-based
// browser in Delphi applications.
//
// The original license of DCEF3 still applies to CEF4Delphi.
//
// For more information about CEF4Delphi visit :
// https://www.briskbard.com/index.php?lang=en&pageid=cef
//
// Copyright © 2019 Salvador Diaz Fau. All rights reserved.
//
// ************************************************************************
// ************ vvvv Original license and comments below vvvv *************
// ************************************************************************
(*
* Delphi Chromium Embedded 3
*
* Usage allowed under the restrictions of the Lesser GNU General Public License
* or alternatively the restrictions of the Mozilla Public License 1.1
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* Unit owner : Henri Gourvest <hgourvest@gmail.com>
* Web site : http://www.progdigy.com
* Repository : http://code.google.com/p/delphichromiumembedded/
* Group : http://groups.google.com/group/delphichromiumembedded
*
* Embarcadero Technologies, Inc is not permitted to use or redistribute
* this source code without explicit permission.
*
*)
unit uSimpleBrowser;
{$I cef.inc}
interface
uses
{$IFDEF DELPHI16_UP}
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls,
{$ELSE}
Windows, Messages, SysUtils, Variants, Classes, Graphics,
Controls, Forms, Dialogs, StdCtrls, ExtCtrls,
{$ENDIF}
uCEFChromium, uCEFWindowParent, uCEFChromiumWindow, uCEFTypes, uCEFInterfaces,
uCEFWinControl;
type
TForm1 = class(TForm)
ChromiumWindow1: TChromiumWindow;
AddressPnl: TPanel;
AddressEdt: TEdit;
GoBtn: TButton;
Timer1: TTimer;
procedure GoBtnClick(Sender: TObject);
procedure FormShow(Sender: TObject);
procedure ChromiumWindow1AfterCreated(Sender: TObject);
procedure Timer1Timer(Sender: TObject);
procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
procedure ChromiumWindow1Close(Sender: TObject);
procedure ChromiumWindow1BeforeClose(Sender: TObject);
private
// You have to handle this two messages to call NotifyMoveOrResizeStarted or some page elements will be misaligned.
procedure WMMove(var aMessage : TWMMove); message WM_MOVE;
procedure WMMoving(var aMessage : TMessage); message WM_MOVING;
// You also have to handle these two messages to set GlobalCEFApp.OsmodalLoop
procedure WMEnterMenuLoop(var aMessage: TMessage); message WM_ENTERMENULOOP;
procedure WMExitMenuLoop(var aMessage: TMessage); message WM_EXITMENULOOP;
protected
// Variables to control when can we destroy the form safely
FCanClose : boolean; // Set to True in TChromium.OnBeforeClose
FClosing : boolean; // Set to True in the CloseQuery event.
procedure Chromium_OnBeforePopup(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const targetUrl, targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; const popupFeatures: TCefPopupFeatures; var windowInfo: TCefWindowInfo; var client: ICefClient; var settings: TCefBrowserSettings; var extra_info: ICefDictionaryValue; var noJavascriptAccess: Boolean; var Result: Boolean);
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
uses
uCEFApplication;
// This is a demo with the simplest web browser you can build using CEF4Delphi and
// it doesn't show any sign of progress like other web browsers do.
// Remember that it may take a few seconds to load if Windows update, your antivirus or
// any other windows service is using your hard drive.
// Depending on your internet connection it may take longer than expected.
// Please check that your firewall or antivirus are not blocking this application
// or the domain "google.com". If you don't live in the US, you'll be redirected to
// another domain which will take a little time too.
// Destruction steps
// =================
// 1. The FormCloseQuery event sets CanClose to False and calls TChromiumWindow.CloseBrowser, which triggers the TChromiumWindow.OnClose event.
// 2. The TChromiumWindow.OnClose event calls TChromiumWindow.DestroyChildWindow which triggers the TChromiumWindow.OnBeforeClose event.
// 3. TChromiumWindow.OnBeforeClose sets FCanClose to True and closes the form.
procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
if GlobalCEFApp.LibLoaded then
begin
CanClose := FCanClose;
if not(FClosing) then
begin
FClosing := True;
Visible := False;
ChromiumWindow1.CloseBrowser(True);
end;
end
else
CanClose := True;
end;
procedure TForm1.FormShow(Sender: TObject);
begin
Caption := 'Simple Browser - Initializing browser. Please wait...';
ChromiumWindow1.ChromiumBrowser.OnBeforePopup := Chromium_OnBeforePopup;
// You *MUST* call CreateBrowser to create and initialize the browser.
// This will trigger the AfterCreated event when the browser is fully
// initialized and ready to receive commands.
// GlobalCEFApp.GlobalContextInitialized has to be TRUE before creating any browser
// If it's not initialized yet, we use a simple timer to create the browser later.
if not(ChromiumWindow1.CreateBrowser) then Timer1.Enabled := True;
end;
procedure TForm1.ChromiumWindow1Close(Sender: TObject);
begin
// DestroyChildWindow will destroy the child window created by CEF at the top of the Z order.
if not(ChromiumWindow1.DestroyChildWindow) then
begin
FCanClose := True;
Close;
end;
end;
procedure TForm1.ChromiumWindow1BeforeClose(Sender: TObject);
begin
FCanClose := True;
PostMessage(Handle, WM_CLOSE, 0, 0);
end;
procedure TForm1.Chromium_OnBeforePopup(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame; const targetUrl,
targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition;
userGesture: Boolean; const popupFeatures: TCefPopupFeatures;
var windowInfo: TCefWindowInfo; var client: ICefClient;
var settings: TCefBrowserSettings;
var extra_info: ICefDictionaryValue;
var noJavascriptAccess: Boolean;
var Result: Boolean);
begin
// For simplicity, this demo blocks all popup windows and new tabs
Result := (targetDisposition in [WOD_NEW_FOREGROUND_TAB, WOD_NEW_BACKGROUND_TAB, WOD_NEW_POPUP, WOD_NEW_WINDOW]);
end;
procedure TForm1.ChromiumWindow1AfterCreated(Sender: TObject);
begin
// Now the browser is fully initialized we can load the initial web page.
Caption := 'Simple Browser';
AddressPnl.Enabled := True;
GoBtn.Click;
end;
procedure TForm1.GoBtnClick(Sender: TObject);
begin
// This will load the URL in the edit box
ChromiumWindow1.LoadURL(AddressEdt.Text);
end;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
Timer1.Enabled := False;
if not(ChromiumWindow1.CreateBrowser) and not(ChromiumWindow1.Initialized) then
Timer1.Enabled := True;
end;
procedure TForm1.WMMove(var aMessage : TWMMove);
begin
inherited;
if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
end;
procedure TForm1.WMMoving(var aMessage : TMessage);
begin
inherited;
if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
end;
procedure TForm1.WMEnterMenuLoop(var aMessage: TMessage);
begin
inherited;
if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := True;
end;
procedure TForm1.WMExitMenuLoop(var aMessage: TMessage);
begin
inherited;
if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := False;
end;
end.